<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #loader {
            position: absolute;
            top: calc(50% - 20px);
            left: calc(50% - 20px);
        }

        @keyframes loader {
            0% {
                left: -100px
            }

            100% {
                left: 110%;
            }
        }

        #box {
            width: 50px;
            height: 50px;
            background: #6997DB;
            animation: animate .5s linear infinite;
            position: absolute;
            top: 0;
            left: 0;
            border-radius: 3px;
        }

        @keyframes animate {
            17% {
                border-bottom-right-radius: 3px;
            }

            25% {
                transform: translateY(9px) rotate(22.5deg);
            }

            50% {
                transform: translateY(18px) scale(1, .9) rotate(45deg);
                border-bottom-right-radius: 40px;
            }

            75% {
                transform: translateY(9px) rotate(67.5deg);
            }

            100% {
                transform: translateY(0) rotate(90deg);
            }
        }

        #shadow {
            width: 50px;
            height: 5px;
            background: #000;
            opacity: 0.1;
            position: absolute;
            top: 59px;
            left: 0;
            border-radius: 50%;
            animation: shadow .5s linear infinite;
        }

        @keyframes shadow {
            50% {
                transform: scale(1.2, 1);
            }
        }


        body {
            background: #fff;
            overflow: hidden;
        }

        h4 {
            position: absolute;
            bottom: 20px;
            left: 20px;
            margin: 0;
            font-weight: 200;
            opacity: .5;
            font-family: sans-serif;
            color: #6997DB;
        }
    </style>
</head>

<body>
    <div id="loader">
        <div id="shadow"></div>
        <div id="box"></div>
    </div>
</body>

</html>